In 1996 Don Gentner and Jakob Nielsen published a thought experiment, The Anti-Mac Interface. It's worth a read. By violating the design principles of the entrenched Mac desktop interface, G and N propose that more powerful interfaces could exceed the aging model and define the "Internet desktop."

It's been almost 20 years since the Anti-Mac design principles were proposed, and almost 30 since the original Apple Human Interface Guidelines were published. Did the Anti-Mac principles supersede those of the Mac?
Here I reflect on the Mac design principles of 1986, the Anti-Mac design principles of 1996, and what I observe as apparent (and cheekily named) Post-Mac design principles of 2016... Er, 2015.

What a load of nonsense. First the lie about Mac inventing or defining anything, then the anti-mac definitions which are not anti but just complementing and silly named, and finally another article noticing 20 year later that they are complementing and declaring his "insight" a new revolution.

are all the current operating systems starting to act the same? Windows 10, Gnome-Shell and Mac OSX, have an easy way of launching applications (finally).

Both Windows 10 and Gnome-shell use the 'Windows key' to bring up a search and then you type some letters and can select the application, I use this all the time. Mac OSX has Command+space. I've seen a hack for KDE to support it, not sure if 5.x has it, since I haven't played with it. But it's a great way to do things.

But I do find a lot of the differences in menus a tad annoying, for example, the 'about' dialog is always under Help under Windows/Linux DEs. Where as under the Amiga and Mac OSX, it's generally under the primary program menu.

I do wish all applications, desktop environments would standardize on where the Okay / Cancel buttons are on dialogs, can't tell you how many times I've clicked on the wrong one due to it being in the opposite place of everything else.